mirror of
https://github.com/uroni/urbackup_backend.git
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145 lines
3.8 KiB
C++
145 lines
3.8 KiB
C++
/*************************************************************************
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* UrBackup - Client/Server backup system
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* Copyright (C) 2011-2016 Martin Raiber
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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**************************************************************************/
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#include "WalCheckpointThread.h"
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#include "../urbackupcommon/os_functions.h"
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#include "../Interface/File.h"
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#include "../Interface/Server.h"
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#include "../Interface/Mutex.h"
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#include "../Interface/Condition.h"
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#include "../Interface/ThreadPool.h"
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#include "database.h"
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#include "../Interface/Database.h"
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#include <memory>
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namespace
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{
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class TimedDbLock : public IThread
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{
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public:
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TimedDbLock()
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: mutex(Server->createMutex()), cond(Server->createCondition()), has_lock(false)
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{
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}
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void operator()()
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{
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IDatabase* db = Server->getDatabase(Server->getThreadID(), URBACKUPDB_SERVER_FILES);
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db->lockForSingleUse();
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{
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IScopedLock lock(mutex.get());
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has_lock = true;
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cond->notify_all();
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}
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Server->wait(1000);
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db->unlockForSingleUse();
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}
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void waitForLock()
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{
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IScopedLock lock(mutex.get());
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while (!has_lock)
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{
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cond->wait(&lock);
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}
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}
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private:
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std::auto_ptr<IMutex> mutex;
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std::auto_ptr<ICondition> cond;
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bool has_lock;
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};
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}
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WalCheckpointThread::WalCheckpointThread()
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: last_checkpoint_wal_size(0)
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{
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}
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void WalCheckpointThread::checkpoint()
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{
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int mode = MODE_READ;
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#ifdef _WIN32
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mode=MODE_READ_DEVICE;
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#endif
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std::auto_ptr<IFile> wal_file(Server->openFile("urbackup" + os_file_sep() + "backup_server_files.db-wal", mode));
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if(wal_file.get()!=NULL)
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{
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int64 wal_size = wal_file->Size();
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if (wal_size > 1 * 1024 * 1024 * 1024) //>1GiB
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{
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wal_file.reset();
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Server->Log("Files WAL file greater than 1GiB. Doing full WAL checkpoint...", LL_INFO);
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IDatabase* db = Server->getDatabase(Server->getThreadID(), URBACKUPDB_SERVER_FILES);
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//Get rid of writers for a second
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TimedDbLock timed_db_lock;
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THREADPOOL_TICKET ticket = Server->getThreadPool()->execute(&timed_db_lock);
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timed_db_lock.waitForLock();
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db->Write("PRAGMA wal_checkpoint(PASSIVE)");
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Server->getThreadPool()->waitFor(ticket);
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db->lockForSingleUse();
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db->Write("PRAGMA wal_checkpoint(TRUNCATE)");
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db->unlockForSingleUse();
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last_checkpoint_wal_size = 0;
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}
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else if (wal_size - last_checkpoint_wal_size > 100 * 1024 * 1024) //100MB
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{
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last_checkpoint_wal_size = wal_size;
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wal_file.reset();
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IDatabase* db = Server->getDatabase(Server->getThreadID(), URBACKUPDB_SERVER_FILES);
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//Get rid of writers for a second
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TimedDbLock timed_db_lock;
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THREADPOOL_TICKET ticket = Server->getThreadPool()->execute(&timed_db_lock);
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timed_db_lock.waitForLock();
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db->Write("PRAGMA wal_checkpoint(PASSIVE)");
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Server->getThreadPool()->waitFor(ticket);
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}
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else if (wal_size < last_checkpoint_wal_size)
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{
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last_checkpoint_wal_size = 0;
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}
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}
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else
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{
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Server->Log("Could not open WAL file (wal checkpoint thread)", LL_WARNING);
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}
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}
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void WalCheckpointThread::operator()()
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{
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while(true)
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{
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Server->wait(10000); //every 10s
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checkpoint();
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}
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}
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